487
FXUS66 KPQR 230004 AAB
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
504 PM PDT SAT AUG 22 2026
UPDATED MARINE DISCUSSION
SYNOPSIS
LOW PRESSURE MOVING OVER THE AREA WILL SEND A WEAK
COLD FRONT THROUGH THE AREA TONIGHT. EXPECT NEAR AVERAGE DAYTIME
HIGHS THROUGH THE WEEK. RIDGING BUILDS BACK INTO THE AREA EARLY
NEXT WEEK, INCREASING TEMPERATURES BACK INTO THE MID TO UPPER
80S ACROSS THE INTERIOR LOWLANDS.
DISCUSSION...TONIGHT THROUGH FRIDAY
AN UPPER LEVEL TROUGH
WILL CONTINUE TO PROGRESS NORTHEAST TONIGHT, SENDING A WEAK
COLD FRONT THROUGH THE AREA. AS THE LOW MOVES FURTHER INLAND, ZONAL
FLOW ALOFT WILL DEVELOP ON SUNDAY. ZONAL FLOW WILL MAINTAIN
SEASONAL TEMPERATURES ACROSS THE FORECAST AREA. LOOKING AHEAD
THROUGH THE EARLY NEXT WEEK, ENSEMBLE CLUSTERS FAVOR RIDGING
OVER THE CENTRAL CONUS WHICH WILL SPREAD INTO THE PACNW. AS THE
RIDGE BUILDS OVER THE AREA, WARMER TEMPERATURE ARE EXPECTED TO
RETURN MONDAY AND TUESDAY. THERE REMAINS SOME UNCERTAINLY AS TO
HOW WARM THE START OF NEXT WEEK WILL BE AS THE 10TH-90TH
PERCENTILES FOR DAYTIME HIGHS RANGE FROM THE MID 80S TO LOW 90S
FOR THE INTERIOR LOWLANDS ON MONDAY AND TUESDAY. CLUSTERS FAVOR
ANOTHER TROUGH INFLUENCING THE REGION BY MID-WEEK BUT EXACT
TIMING AND UPPER LEVEL PATTERN ARE UNCERTAIN BUT ONSHORE FLOW
AND SEASONABLE OR BELOW AVERAGE TEMPERATURES WOULD BE FAVORED.
WHEN LOOKING AT WEDNESDAY AND THURSDAY, THE 10TH-90TH
PERCENTILES RANGE FROM THE LOW 70S TO LOW 80S. THERE IS ALSO NO
CLEAR SIGNAL FOR ANY PRECIPITATION ASSOCIATED WITH THE MID WEEK
TROUGH. APPROXIMATELY 15-25% OF MEMBERS SHOW VERY LIGHT RAIN
POSSIBLE DURING THE THURSDAY-FRIDAY TIMEFRAME BUT NOTHING
SIGNIFICANT AT THIS TIME. /42-19
AVIATION
AN UPPER-LEVEL LOW CURRENTLY OFFSHORE CONTINUES
MOVING NORTH/NORTHEAST. THIS LOW HAS RESULTED IN A MIXTURE OF MVFR
AND VFR CONDITIONS ALONG WITH SOUTHERLY WINDS ACROSS THE AIRSPACE.
SOUTHERLY WINDS ARE EXPECTED TO PERSIST, WITH THE MVFR/VFR
MIXTURE INLAND CONTINUING TO SLOWLY IMPROVE TO PREDOMINATELY VFR
CONDITIONS FOR ALL INLAND LOCATIONS. THESE VFR CONDITIONS INLAND
ARE EXPECTED TO PERSIST THROUGH AT LEAST 04Z-06Z SUNDAY.
AFTERWARDS, MVFR CONDITIONS ARE EXPECTED TO RETURN ACROSS ALL
INLAND LOCATIONS.
COASTAL LOCATIONS WILL MAINTAIN GENERALLY MVFR CONDITIONS THROUGH
THE TAF PERIOD. THERE IS A LOW PROBABILITY (10-20%) THAT BRIEF
PERIODS OF VFR CONDITIONS WILL CONTINUE TO OCCUR ALONG THE COAST
FROM THROUGH 00Z SUNDAY. GUSTS APPROACHING 25 KT EXPECTED ALONG
THE COAST THROUGH AROUND 06Z SUNDAY.
KPDX AND APPROACHES...MVFR CONDITIONS WILL IMPROVE TOWARDS VFR
THROUGH 22Z SATURDAY. SOUTHERLY WINDS EXPECTED TO PERSIST THROUGH
THE TAF PERIOD. AROUND 05Z-08Z MVFR CONDITIONS ARE EXPECTED TO
RETURN AND PERSIST THROUGH THE REMAINDER OF THE TAF PERIOD. /42
MARINE
SOUTH TO SOUTHWEST WINDS CONTINUE THROUGH TONIGHT AS A
LOW PRESSURE SYSTEM MOVES OVER THE NORTHEAST PACIFIC. HIGH
PRESSURE AND NORTHERLY WINDS RETURN BY SUNDAY, WITH A 40-70%
CHANCE FOR NORTHERLY WIND GUSTS UP TO 25 KT IN THE EVENING AND
CONTINUING INTO MONDAY. SEAS OF 4-6 FT PERSIST THROUGH THE PERIOD.
/42
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
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